<!DOCTYPE html>
<html>
    <head>
        <title>serviceWorker</title>
        <script>
         var done = false;
         var error;
         try {
             navigator.serviceWorker.register("serviceWorker.js")
             .then((r) => { done = true; })
             .catch((e) => { done = true; error = e.message; });
         } catch (e) {
             done = true; error = e.message;
         }
        </script>
    </head>
    <body></body>
</html>
